Flashybrid

http://hacks.slashdirt.org/sw/flashybrid/

apt-get update
apt-get install rsync
wget http://hacks.slashdirt.org/sw/flashybrid/flashybrid_0.21_all.deb
dpkg -i flashybrid_0.21_all.deb

/etc/default/flashybrid:

# This file controls the flashybrid init script.

# Whether to start flashybrid on boot, and shut it down on shutdown.
# This has the potential to break your system if it is turned on, so
# make sure you understand flashybrid, and have configured it for your
# system, before turning this on.
ENABLED=yes

# Whether to display a message before a directory is synchronized or not.
VERBOSE=yes

/etc/flashybrid/config:

# This is the main configuration file for the flashybrid system.

# The space-separated mountpoint(s) of your flash memory.
# Support for multiple mountpoints is experimental. Because mountpoints
# are space-separated, they must not have a space in their full path.
# example: FLASHMOUNT="/ /srv"
FLASHMOUNT="/"

# You probably want a ramdisk to be set up with directories that the system
# needs to write data to frequently, so that your flash disk can be mounted
# read-only. Flash memory can only be written to several thousand times over
# its lifetime, so setting up a ramdisk will extend the lifetime of your
# flash a lot. This is the location to mount the ramdisk. Comment out the
# line to not set up a ram disk.
RAMMOUNT=/ram

# This controls the maximum ammount of memory you want to allocate  
# to the tmpfs RAM drive
# This parameter is optional, and if you do not supply if, tmpfs will
# occupy up to 50% of your available memory (ram+swap)
# FLASH_MAX=92m

# You may also want to edit the other files in this directory:
# ramtmp, ramstore